Johnson Controls VMA1930 User manual

VMA1930 VAV Controller Installation Guide

Application

The VMA1930 equipment controllers are designed

for Variable Air Volume (VAV) applications that

communicate over BACnet®/IP networks. These

Variable Air Volume Modular Assembly (VMA)

controllers feature combinations of an integral

digital pressure sensor (DPT), a damper actuator,

and a 32-bit microprocessor. The controllers' small

package size facilitates quick field installation and

efficient use of space without compromising high-

tech control performance. The VMA1930 controllers

include an integral real-time clock, which enables

the controllers to monitor and control schedules,

calendars, and trends, and operate for extended

periods of time as stand-alone controllers when

offline from the Metasys® system network. These

VMA controllers connect easily to the wired and

wireless network sensors for zone and discharge air

temperature sensing.

The Metasys system Field Equipment Controllers

(FEC) family controllers and network sensors

communicate using the BACnet protocol. The

BACnet protocol is a standard for ANSI, ASHRAE,

and the International Standards Organization (ISO)

for building controls. VMA1930 Field Controllers

are BACnet Testing Laboratories (BTL) listed and

certified BACnet Advanced Application Controllers

(B-AACs).

North American emissions

compliance

United States

This equipment has been tested and found to

comply with the limits for a Class A digital device

pursuant to Part 15 of the FCC Rules. These limits

are designed to provide reasonable protection

against harmful interference when this equipment

is operated in a commercial environment. This

equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in

accordance with the instruction manual, may cause

harmful interference to radio communications.

Operation of this equipment in a residential area

may cause harmful interference, in which case the

users will be required to correct the interference at

their own expense.

Canada

This Class (A) digital apparatus meets all the

requirements of the Canadian Interference-Causing

Equipment Regulations.

Cet appareil numérique de la Classe (A) respecte

toutes les exigences du Règlement sur le matériel

brouilleur du Canada.

Installation

Observe the following guidelines when installing a

VMA1930 controller:

• Transport the controller in the original container

to minimize vibration and shock damage to the

controller.

• Do not drop the controller or subject it to physical

shock.

Parts included

• One VMA1930 controller with removable SA bus

and power terminal blocks

• One installation instructions sheet

• One self-drilling No. 10 x 25 mm (1 in.) screw

Materials and special tools needed

• Several 6 mm (1/4 in.) female spade terminals for

input and output wiring, and crimping tool for

spade mounted terminal blocks

• Small, straight-blade screwdriver for securing

wires in the terminal blocks, can also be used to

adjust controller numbers

• 8 mm (5/16 in.) wrench or 10 mm (3/8 in.) 12-point

socket to tighten the square coupler bolt

• Several shims or washers to mount the VMA

• Power screwdriver, 100 mm (4 in.) extension

socket, punch, drill, and 3.5 mm (9/64 in.) drill bits

to mount the VMA

• Pliers to open and close the damper

*2410143853C*

Part No. 24-10143-853 Rev. C

2019-11-21

(barcode for factory use only)

MS-VMA1930-0

• Required length of 3.97 mm (5/32 in.) ID

pneumatic tubing and barbed fittings VMA1930 physical features

The following figure displays the physical features

of the VMA1930, and the accompanying table

provides a description of the physical features and a

reference to further information where required.

Figure 1: VMA1930 Controller wiring terminations and physical features

Table 1: VMA1930 Feature Callout Numbers and

Descriptions

Callout Physical Features: Description and References

124 VAC, Class 2 Supply Power (see Supply power

terminal block)

2Controller Number Rotary Switches (see Setting the

controller number): can be numbered from 000 to 999

3 Binary Outputs, 24 VAC Triacs (see Table 3)

4Configurable Outputs: Voltage Analog Output (0–10

VDC) and Binary Output (24 VAC Triac) (see Table 3)

5 Dual Port Fitting

6Manual Override Button (see Mounting for information

about using manual override Button)

7Controller Coupler (see Mounting for information about

using the controller coupler )

8Coupler Bolt (see Mounting for information about

setting the coupler bolt )

Table 1: VMA1930 Feature Callout Numbers and

Descriptions

Callout Physical Features: Description and References

Universal Input: Voltage Analog Input (0–10 VDC)

Resistive Analog Inputs (0–600k ohm) (see Table 3):

0–2k Potentiometer

RTD: 1k Nickel, 1k Platinum, or A99B SI

NTC: 10K Type L (10K Johnson Controls Type II is

equivalent to Type L) or 2.252K Type II

Dry Contact Binary Input

10 SA Bus Terminal Block (see SA Bus terminal block)

11 Sensor Port (SA Bus) RJ-12 6-Pin Modular Jack (see SA

Bus port)

12 ETH2 Ethernet Port for BACnet/IP Communications

13 ETH1 Ethernet Port for BACnet/IP Communications

14 Captive Spacer and Screw

15 LED Status Indicators (see Table 7)

VMA1930 VAV Controller Installation Guide2

VMA1930 model information

Table 2: VMA1930 information (including point type counts per model)

Communication Protocol BACnet/IP

Engines Supported NAE55, NAE85, ODS

Modular Jacks 6-pin SA Bus with four communicating

sensors

Point Types Signals Accepted Number of Points

Universal Input (UI)

Analog Input, Voltage Mode, 0–10 VDC

Analog Input, Current Mode, 4-20mA

Analog Input, Resistive Mode, 0–2k ohm, RTD (1k

NI [Johnson Controls], 1k PT, A998 SI), NTC (10k

Type L, 2.252k Type 2)

Binary Input, Dry Contact Maintained Mode

Binary Output (BO) 24 VAC Triac 3

Configurable Output (CO) Analog Output, Voltage Mode, 0–10 VDC

Binary Output Mode, 24 VAC Triac 2

Integrated Actuator Internal 1

Differential Pressure Transducer (DPT) Internal 1

Up to 4 NS Series Network Zone Sensors

Zone Sensor Input On SA Bus Up to 5 WRZ sensors when using the one-to-

one WRZ-78xx wireless configuration

VMA1930 VAV Controller Installation Guide 3

Mounting

Observe the following guidelines when mounting a

VMA:

Note: When the air supply to the VAV box

is below 10°C (50°F), make sure that any

condensation on the VAV box, particularly on

the damper shaft, does not enter the VMA

• Ensure that the mounting surface can support

the controller and any user-supplied enclosure.

electronics. Mount the controller vertically above

the damper shaft to allow any shaft condensation

to fall away from the controller. Additional

measures may be required in some installations.

• Mount the controller on a hard, even surface

whenever possible.

• Use shims or washers to mount the controller

securely and evenly on the mounting surface.

• Mount the controller in an area free of corrosive

vapors that matches the ambient conditions

specified in the Technical specifications section.

• Provide sufficient space around the controller

for cable and wire connections and adequate

ventilation through the controller (at least 50 mm

[2 in.] on the top, bottom, sides, and front of the

controllers).

• Mount the VMA vertically above the damper shaft

to allow any shaft condensation to fall away from

the VMA.

Do not mount the controller in areas where

electromagnetic emissions from other

devices or wiring can interfere with controller

communication.

• Avoid mounting the controller on surfaces with

excessive vibration.

On panel or enclosure mount applications, observe

these additional guidelines:

• Do not install the controller in an airtight

enclosure.

• Mount the controller so that the enclosure walls

do not obstruct cover removal or ventilation

through the controller.

• Mount the controller so that the power

transformer and other devices do not radiate

excessive heat to the controller.

To mount the controllers, complete the following

steps:

1. Set all the switches on the field controller to

their known settings.

2. Place the controller in the proper mounting

position on the damper shaft so that the wiring

connections are easily accessible. Make sure

the controller base is parallel to the VAV box

(perpendicular to the damper shaft). If needed,

use a spacer to offset tipping of the controller

caused by the shaft bushings.

Note: Use the alignment marks to center

the captive spacer to ensure sufficient

movement in either direction.

3. Secure the self-drilling No. 10 screw through

the captive spacer with a power screwdriver

and 100 mm (4 in.) extension socket. Otherwise,

use a punch to mark the position of the

shoulder washer, and then drill a hole into the

VAV box using a 3.5 mm (9/64 in.) drill bit. Insert

the mounting screw and tighten against the

spacer.

Important: Do not overtighten the screw,

or the threads may strip. If mounting to

the VAV box, make sure the screws do not

interfere with damper blade movement.

4. Locate the damper position using the typical

marking on the end of the damper shaft as

shown in the following figure.

Figure 2: Typical Damper End Shaft Icons

5. Note the direction, clockwise (CW) or

counterclockwise (CCW), required to close the

damper. Grasp the damper shaft firmly with

pliers, and either manually close the damper for

90° boxes or manually open the damper for 45°

or 60° boxes.

VMA1930 VAV Controller Installation Guide4

6. Push down and hold the Manual Override

button (see VMA1930 physical features) and

turn the controller coupler until it contacts the

mechanical end-stop at either the full-closed

(90° boxes) or full-open (45° and 60° boxes)

position.

7. If the damper for a 90° box closes CCW, rotate

the coupler to the CCW mechanical limit. If

the damper for a 90° box closes CW, rotate

the coupler to the CW mechanical limit. The

open end-stop is automatically set for 90°

boxes. For 45° and 60° boxes, hard stops must

be provided at both full-closed and full-open

damper positions. By installing the controller at

the full-open position, the controller provides

the open stop for 45° and 60° boxes. The closed

damper seal provides the full-closed stop.

Note: The integrated actuator has a

stroke time of 60 seconds for 90° of travel.

The stroke time is the amount of time

(in seconds) that it takes the actuator

to move from the fully closed to fully

opened position or from fully open to fully

closed position. For proper operation, the

actuator stroke time must be configured

in the CCT application based on the actual

time it takes the actuator to drive the

damper. The default setting is 60 seconds

(for 90° VAV boxes). For 45° and 60° VAV

boxes, the actuator stroke time must be

adjusted. Refer to Controller Tool Help

(LIT-12011147) for instructions on setting

the actuator stroke time in the application.

8. All models are compact in size and can be

easily installed on VAV boxes. The models have

either a round shaft up to 13 mm in diameter

or a 10 mm square shaft. Tighten the square

coupler bolt to the shaft using an 8 mm (5/16

in.) wrench or 10 mm (3/8 in.) 12-point socket.

Tighten to 10.5 to 11.5 N·m (95 to 105 lb·in).

9. (Skip this step if you are installing the

VMA1626 model) Loop the pneumatic tubing

(supplied by field personnel) to include a

trap for condensation. Attach the needed

length of tubing (supplied and installed by

field personnel) to the dual port fitting on the

controller and the other ends of the tubing

to the pressure transducer in the VAV box

application.

Note: The controller uses a digital non-

flow pressure sensor with bidirectional

flow operation. You can connect the high-

and low-pressure DP tubes to either

barbed fitting on the controller. You do not

need to make a specific high- or low-side

connection when you attach the tubing to

the barbed fittings on the controller.

10. Push the Manual Override button, and turn the

actuator coupling manually to ensure that the

actuator can rotate from full-closed to full-open

positions without binding.

11. Complete the mounting by rotating the damper

to the full-open position.

CAUTION

Risk of Property Damage

Rotate the damper to the full-open position before

starting the air handler. Failure to rotate the damper to

the full-open position may result in damage to the VAV

box or ductwork when the air handler is started.

ATTENTION

Risque de dégâts matériels

Faire pivoter le registre pour le placer en position

d'ouverture complète avant de démarrer l'unité de

traitement d'air. Le non-respect de cette directive

risque d'endommager le caisson de l'unité à volume

d'air variable (VAV) ou le réseau de conduites au dé-

marrage de l'unité de traitement d'air.

Wiring

CAUTION

Risk of Electric Shock

Disconnect the power supply before making electrical

connections to avoid electric shock.

VMA1930 VAV Controller Installation Guide 5

ATTENTION

Risque de décharge électrique

Débrancher l'alimentation avant de réaliser tout rac-

cordement électrique afin d'éviter tout risque de

décharge électrique.

Important: Do not connect supply power

to the controller before finishing wiring and

checking all wiring connections. Short circuits

or improperly connected wires can result

in damage to the controller and void any

warranty.

Important: Do not exceed the controller

electrical ratings. Exceeding controller electrical

ratings can result in permanent damage to the

controller and void any warranty.

Important: Use copper conductors only. Make

all wiring in accordance with local, national, and

regional regulations.

Important: Electrostatic discharge can

damage controller components. Use proper

electrostatic discharge precautions during

installation, setup, and servicing to avoid

damaging the controller.

For information on configuring and wiring

a BACnet/IP network, refer to the Metasys IP

Networks for BACnet/IP Controllers Configuration

Guide (LIT-12012458). For detailed information on

configuring and wiring a SA Bus, refer to the MS/TP

Communications Bus Technical Bulletin (LIT-12011034).

Network topology

VMA1930 controllers may be connected to a building

automation network in multiple ways: as daisy-

chained devices, as part of a star (also called home

run) type network, or as part of a ring network.

To daisy-chain VMA1930 controllers, connect the

controllers to the bus supervisor in a chain with

the Ethernet cable connecting to the VMA1930

at the ETH1 or ETH2 port, and connecting to the

next device from the other port. Benefits of daisy-

chained networks are that they require less physical

wiring and new devices can be added easily to the

network.

In a star network, each VMA1930 controller is

connected by Ethernet cable directly back to a main

switch. This configuration reduces the possibility of

network failure but requires more wiring to install.

A ring network is a chain of controllers virtually

closed by a software component in an Ethernet

switch. Not all switches support the ring topology.

The dual-port controller from Johnson Controls

supports Media Redundancy Protocol (MRP). With

MRP, a chain of Ethernet devices can overcome any

single communication failure, with a recovery time

faster than in a BACnet system.

For more information about network topologies for

Metasys BACnet/IP Controllers, refer to the Metasys

IP Networks for BACnet/IP Controllers Configuration

Technical Bulletin (LIT-12012458).

VMA terminals and bus ports

See VMA1930 physical features for input and output

terminal and bus port locations on the controllers.

Observe the following guidelines when wiring a

VMA controller.

Input and Output terminals

The input spade terminals are located on the

bottom of the VMA near the FC Bus terminal block.

The output spade terminals are located on the top

of the controller near the power supply terminal

block. For more information, see Table 3.

SA Bus terminal block

The SA Bus terminal block is a brown, removable,

4-terminal plug with +15 VDC that fits into a board-

mounted jack. Wire the removable SA Bus terminal

block plugs on the VMA and other SA Bus devices

in a daisy-chain configuration using 4-wire twisted,

shielded cable as shown in Figure 3. See Table 5 for

more information.

Figure 3: SA bus terminal block wiring

VMA1930 VAV Controller Installation Guide6

SA Bus port

The Sensor (SA Bus) port on the bottom of the

controller is an RJ-12, 6-position modular jack that

provides a connection for the Mobile Access Portal

(MAP) Gateway, the Bluetooth Commissioning

Converter (BTCVT), the VAV Balancing Tool, specified

network sensors, or other SA Bus devices with RJ-12

plugs. A DIS1710 Local Controller Display can also be

connected to the SA Bus port.

Note:

• Do not use the modular SA Bus port and the

terminal block SA Bus simultaneously. Only

use one of these connections at a time.

• The MAP Gateway serves as a replacement

for the BTCVT, which is no longer available

for purchase, but continues to be supported.

The Sensor port is connected internally to the SA

bus terminal block. For more information about

Sensor port functions, requirements, and ratings,

see Table 5.

Figure 4: Pin number assignments for Sensor

(SA Bus) Port on VMA1930

Supply power terminal block

The 24 VAC supply power terminal block is a

gray, removable, 2-terminal plug that fits into a

board-mounted jack on the upper left of the VMA

controller.

Wire the 24 VAC supply power wires from the

transformer to the HOT and COM terminals on the

terminal plug as shown in the following figure. See

Table 5 for more information.

Figure 5: 24 VAC supply power terminal block

wiring

The supply power wire colors may be different on

transformers from other manufacturers. Refer to

the transformer manufacturer’s instructions and

the project installation drawings for wiring details.

Important: Connect 24 VAC supply power to

the controller and all other network devices

so that transformer phasing is uniform across

the network devices. Powering network

devices with uniform 24 VAC supply power

phasing reduces noise, interference, and

ground loop problems. The controller does not

require an earth ground connection. However,

when grounding the secondary of the 24 VAC

transformer is required, only one connection to

ground should be made near the transformer.

See the following figure.

Figure 6: Transformer Grounding

VMA1930 VAV Controller Installation Guide 7

CAUTION

Risk of Property Damage

Do not apply power to the system before checking all

wiring connections. Improper wiring of this terminal

may cause a short circuit across the 24 VAC power

supply on VMA models. A short circuit may result in a

tripped circuit breaker or blown fuse. If using a trans-

former with a built-in fuse, the transformer may need

to be replaced.

ATTENTION

Risque de dommages matériels

Ne mettez pas l’appareil sous tension avant d’avoir

vérifié toutes les connexions du câblage. Le câblage

inadéquat de cette borne peut causer un court-cir-

cuit sur l’alimentation électrique de 24 V c.a. des VMA

modèles. Un court-circuit peut causer le déclenche-

ment du disjoncteur ou le grillage d’un fusible. Si vous

utilisez un transformateur avec un fusible intégré,

vous pourriez devoir remplacer le transformateur.

To wire the controller, complete the following steps:

1. Terminate wiring according the appropriate

figure in Termination diagrams.

2. Wire network sensors and other devices to the

VMA's SA Bus.

3. Wire the FC Bus in a daisy chain.

4. Ensure that the device address DIP switches

are set to the appropriate device address (See

Setting the controller number). Also, activate

the EOL switch if necessary.

5. Connect the controller to 24 VAC, Class 2 power.

Note: If you are using the

VMA1615/1626/1628/1630 controller with

the Wireless Field Bus System, refer to the

WNC1800/ZFR182x Pro Series Wireless Field Bus

System Bulletin (LIT-12012320) or the ZFR Series

Wireless Field Bus System Bulletin (LIT-12011336).

Terminal wiring guidelines,

functions, ratings, and

requirements

Input and Output wiring guidelines

See Table 3 for information about the functions,

ratings, and requirements for the input and output

terminals, and for wire sizes and cable lengths

guidelines.

In addition, observe the following guidelines when

wiring inputs and outputs:

• Run all low-voltage wiring and cables separate

from high-voltage wiring.

• All input and output cables, regardless of wire

size or number of wires, should consist of twisted,

insulated, and stranded copper wires.

• Shielded cable is not required for input or output

cables but is recommended for input and output

cables that are exposed to high electromagnetic

or radio frequency noise.

• Cable runs of less than 30 m (100 ft) typically do

not require an offset in the input/output software

setup.

• Cable runs over 30 m (100 ft) may require an

offset in the input/output software setup.

VMA1930 VAV Controller Installation Guide8

I/O terminal blocks, ratings and requirements

Table 3: I/O terminal blocks, functions, ratings, requirements, and cables

Terminal block label Terminal labels Function, ratings, and requirements To determine wire size and

maximum cable length

+15 V

15 VDC Power Source for active (3-wire) input

devices connected to the Universal INn terminals.

Provides 35 mA total current.

Same as (Universal) INn.

Note: Use 3-wire cable for

devices that source power

from the +15 V terminal.

Analog Input - Voltage Mode (0–10 VDC)

10 VDC maximum input voltage

Internal 75k ohm Pulldown

See Guideline A in Table 4.

Analog Input - Resistive Mode (0–600k ohm)

Internal 12 V, 15k ohm pull up

Qualified Sensors: 0–2k potentiometer,

RTD (1k Nickel [Johnson Controls sensor],

1k Platinum, and A99B Silicon Temperature Sensor)

Negative Temperature Coefficient (NTC) Sensor

10K Type L (10K Johnson Controls Type II is

equivalent to Type L) or 2.252K Type II

See Guideline A in Table 4.INn

Binary Input - Dry Contact Maintained Mode

1 second minimum pulse width

Internal 12 V, 15k ohm pull up

See Guideline A in Table 4.

UNIVERSAL

(Inputs)

ICOMn

Universal Input Common for all Universal IN

terminals

Note: All Universal ICOMn terminals are

isolated from all other commons.

Same as (Universal) INn.

OUTnBinary Output - 24 VAC Triac (Internal Power)

Sources internal 24 VAC power (24~ HOT) See Guideline C in Table 4.

BINARY

(Outputs) OCOMn

Binary Output - 24 VAC Triac (Internal Power)

Connects OCOMn to 24~ COM when activated.

Internal Power Source:

30 VAC maximum voltage to load

0.5 A maximum output current

1.3 A at 25% duty cycle

40 mA minimum load current

See Guideline C in Table 4.

VMA1930 VAV Controller Installation Guide 9

Table 3: I/O terminal blocks, functions, ratings, requirements, and cables

Terminal block label Terminal labels Function, ratings, and requirements To determine wire size and

maximum cable length

Analog Output - Voltage Mode (0–10 VDC)

10 VDC maximum output voltage

10 mA maximum output current

External 1k to 50k ohm load required

See Guideline A in Table 4.

OUTn

Binary Output 24 VAC Triac

Connects OUT to OCOM when activated.

External Power Source:

30 VAC maximum voltage to load

0.5 A maximum output current

1.3 A at 25% duty cycle

40 mA minimum load current

See Guideline C in Table 4.

Analog Output Signal Common: All Configurable

Outputs defined as Analog Outputs share a

common, which is isolated from all other commons

except the Binary Input common.

CONFIGURABLE

(Outputs)

OCOMnBinary Output Signal Common: All Configurable

Outputs defined as Binary Outputs are isolated

from all other commons, including other

Configurable Output commons.

Same as (Configurable) OUTn.

Cable and wire length guidelines

The following table defines cable length guidelines

for the various wire sizes that may be used for

wiring low voltage (<30 V) input and outputs.

Table 4: Cable length guidelines

Guideline Wire size/Gauge and type Maximum cable length and

type Assumptions

1.0 mm (18 AWG) stranded copper 457 m (1,500 ft) twisted wire

0.8 mm (20 AWG) stranded copper

297 m (975 ft) twisted wire 297 m (975 ft) twisted wire

0.6 mm (22 AWG) stranded copper

183 m (600 ft) twisted wire 183 m (600 ft) twisted wire

0.5mm (24 AWG) stranded copper

107 m (350 ft) twisted wire 107 m (350 ft) twisted wire

100 mV maximum voltage drop

Depending on the cable length

and the connected input or

output device, you may have

to define an offset in the setup

software for the input or output

point.

1.0 mm (18 AWG) stranded copper 229 m (750 ft) twisted wire

0.8 mm (20 AWG) stranded copper

297 m (975 ft) twisted wire 137 m (450 ft) twisted wire

0.6 mm (22 AWG) stranded copper

183 m (600 ft) twisted wire 91 m (300 ft) twisted wire

0.5mm (24 AWG) stranded copper

107 m (350 ft) twisted wire 61 m (200 ft) twisted wire

100 mV maximum voltage drop

Depending on the cable length

and the connected input or

output device, you may have

to define an offset in the setup

software for the input or output

point.

See Maximum cable length versus

load current to select wire size/

gauge.

Use stranded copper wire.

See Maximum cable length

versus load current to determine

cable length.

Use twisted wire cable.

N/A

VMA1930 VAV Controller Installation Guide10

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